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Bindings.fold
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Bindings.fold
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{- # Bindings -}
-- Value definition
val a = 1
-- Value definition with type annotation
val a :: Int = 1
-- Multiple recursive value definitions
val a = 1,
b = c + a,
c = a + 10
-- Function definition
def f a =
a + 1
-- Function definition with block
def f a =
let result = a + 1 in
print "result = $result"
-- Function definition with type annotation
def f a :: Int -> Int =
a + 1
-- Function definition with inline type annotation
def f (a :: Int) -> Int =
a + 1
-- Function definitions with type declaration
def f :: Int -> Int
def f a = a + 1
-- Function definitions with pattern matching
def f 1 = 0
| f a = a + 1
-- Function definition as a value
val f = a -> a + 1
-- [calculate_magic] prints a string representation of a magic number.
def calculate_magic () =
let
magic_number = 42 + fib another_regular_number,
regular_number = 1,
another_regular_number = 2
let add_one x = x + 1
let factorial n =
match n
| 0 -> 1
| n -> n * factorial (n - 1)
end
let fib n =
if n == 0 || n == 1 then 1
else fib (n - 1) + fib (n - 2)
in
print ("The value of fib (magic_number + regular_number) is "
++ string (fib (magic_number + regular_number)) ++ "!")
val x =
some_number + factorial 10
where
some_number = 23,
factorial n =
match n
| 0 -> 1
| n -> n * factorial (n - 1)
end
-- * --
-- ### Semicolons for Definitions
let x = f x y z; e
=> let x = f x y z in e
f x y z; e
=> let () = f x y z in e
{- [calculate_magic] prints a string representation of a magic number. -}
fun calculate_magic () =
val magic_number = 42 + fib another_regular_number,
regular_number = 1,
another_regular_number = 2,
f x = 2
fun add_one x = x + 1
fun factorial n =
match n
| 0 => 1
| n => n * factorial (n - 1)
end
fun fib 0 = 1
| fib 1 = 1
| fib n = fib (n - 1) + fib (n - 2)
in
print ("The value of fib (magic_number + regular_number) is "
++ string (fib (magic_number + regular_number)) ++ "!")
-- ## Let Expressions
let a = 1
print "The value of a is $a!"
let f a = a + 1
print "The value of (f a) is $(f 4)!"
let test () =>
let
a = 1
f b = b + 1
factorial =>
match n
| 0 -> 1
| n -> n * factorial (n - 1)
end
factorial2 =
| 0 -> 1
| n -> n * factorial (n - 1),
c = 3
in
print "The value of a, f b, c are $a, $(f 4), $c!"
-- ## Where Expressions
print "The value of a is $a!"
where a = 1
print "The value of (f a) is $(f 4)!"
where f a = a + 1
print "The value of a, f b, c are $a, $(f 4), $c!"
where
a = 1
f b = b + 1
factorial n =
match n
| 0 -> 1
| n -> n * factorial (n - 1)
end
factorial2 =
| 0 -> 1
| n -> n * factorial (n - 1),
c = 3
end
-- * --
fun calculate_magic () =
let magic_number = 42 + fib another_regular_number,
regular_number = 1,
another_regular_number = 2
let add_one x = x + 1
let factorial =
match n
| 0 => 1
| n => n * factorial (n - 1)
end
let fib 0 = 1
| fib 1 = 1
| fib n = fib (n - 1) + fib (n - 2)
in
print ("The value of fib (magic_number + regular_number) is "
++ string (fib (magic_number + regular_number)) ++ "!")
let calculate_magic =
let magic_number = 42 + fib another_regular_number,
regular_number = 1,
another_regular_number = 2
let add_one x = x + 1
let factorial =
match n
| 0 => 1
| n => n * factorial (n - 1)
end
let fib
| 0 | 1 => 1
| n => fib (n - 1) + fib (n - 2)
end in
print ("The value of fib (magic_number + regular_number) is "
++ string (fib (magic_number + regular_number)) ++ "!")
def test () =>
let
magic_number = 42,
regular_number = 1,
fun add_one x => x + 1,
fun factorial =>
match n
| 0 => 1
| n => n * factorial (n - 1)
c = 3,
fun fib n =>
| 0 | 1 => 1
| n => fib (n - 1) + fib (n - 2)
in
print "The value of a, f b, c are $a, $(f 4), $c!"
-- StandardML style
def test () => let
val a = 1
fun f b = b + 1
fun factorial =>
match n
| 0 -> 1
| n -> n * factorial (n - 1)
end
fun factorial2 =>
| 0 -> 1
| n -> n * factorial (n - 1),
val c = 3
in
print "The value of a, f b, c are $a, $(f 4), $c!"
function test () =
let
a = 1
f b = b + 1
factorial =>
match n
| 0 -> 1
| n -> n * factorial (n - 1)
end
factorial2 =>
| 0 -> 1
| n -> n * factorial (n - 1),
c = 3
in
print "The value of a, f b, c are $a, $(f 4), $c!"
-- * --
module Person = ...
interface Comparable = ...
def hello name = ...
object
def say_hello () =
print
end
-- * --
-- StandardML
fun heron (a, b, c) = let
val ab = dist (a, b)
val bc = dist (b, c)
val ac = dist (a, c)
val perim = ab + bc + ac
val s = perim / 2.0
in
Math.sqrt (s * (s - ab) * (s - bc) * (s - ac))
end
def heron a b c =
let
ab = dist (a, b)
bc = dist (b, c)
ac = dist (a, c)
perim = ab + bc + ac
s = perim / 2.0
in
Math.sqrt (s * (s - ab) * (s - bc) * (s - ac))
end
def heron a b c =
Math.sqrt (s * (s - ab) * (s - bc) * (s - ac))
where
ab = dist (a, b)
bc = dist (b, c)
ac = dist (a, c)
perim = ab + bc + ac
s = perim / 2.0
end
-- * --
var x = 0 -- let x = ref 0
macro var $name = $val
$name = ref $val
end
x = ref 0
x!